Light plays tricks
When I think of a mirage, I think of hallucinating an oasis in a desert. But there are other ways in which the eyes are tricked.
Sometimes, at high altitudes, when the sun is shining brightly in the background and the light casts a shadow on a cloud or into the fog, the Brocken spectre will appear. A ghostly human-like figure which appears to be looking at you through the haze. In truth what we’re seeing is our own shadow.
The way light plays in our world, eerie as it sometimes can be, is fascinating.
Photo courtesy of Brocken Inaglory, CC BY-SA 3.0 File:Solar\_glory\_and\_Spectre\_of\_the\_Brocken\_from\_GGB\_on\_07-05-2011.jpg
(Note: I normally put some filters on the photos but I did not make any changes to this picture.)
https://www.treehugger.com/famous-mirages-play-tricks-eyes-4869278